Controlling a text box with a check box

Hey,
I want to enable a text box when a check box is pressed. I am using asp.net 2.0 with vb. 
Here is my current code, no errors are returned but it doesn't do anything when the check box is clicked.


<%@ Page Title="" Language="VB" MasterPageFile="~/MasterLogin.master" AutoEventWireup="false" CodeFile="myaccount.aspx.vb" Inherits="myaccount" %> <script runat="server"> Sub PasswordCheckbox_onclick(ByVal s As Object, ByVal e As EventArgs)
PasswordCheckBox.Checked = PasswordTxtBx.Enabled PasswordCheckBox.Checked = Password2TxtBx.Enabled End Sub </script> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolderMain" Runat="Server">
<asp:CheckBox ID="Pas ...